Is this a habitat you made or one you bought? I have seen a commerical one that recommends you only start with 15 bugs and it also indicated that it was for short time use (several months). I assumed that was so that it would not be overcrowded.

There are certain sorts of animals that only reproduce commensurate to the space around them. That means that they will instantly sense the boundaries of their enclosure and reproduce accordingly. And if this is not the case and they do overproduce, then the population will instantly self-correct itself through a massive dieoff.

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If you are worried about this, you could start with just 12. That way it will take a long time for the population to grow.